Hillary has a size-of-government fight on her hands.

Republican activists strapping on body armor for the impending presidential campaign may get what they’ve been itching for—the Battle of Washington. That would be the long struggle between Big Government and whatever remnants of individual liberty haven’t disappeared inside the federal maw of rules, laws, programs or prosecutions.

To conservatives this is the Leviathan state, an opponent normally thrashed in 400-page books. In real life, the federal Leviathan simply expands annually. This election could be different,...

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